c2d26988fd
since not all Armv7-m platform support double-precision floating operations, so we add an extra option that help those specific platform could define the single-precision floating operations. for example, qemu-mps platform(armv7-m) support double-precision floating operations, so we do not need to open CONFIG_ARM_FPU_SINGLE_HARDWARE build options; but for fc7300 platform(armv7-m) only support single-precision floating operations, so if we pass "-fhard" build option to "ghs" compiler, then the following instruction will be generated: vcvt.f64.s32 d9, s18 which will fail to execute on fc7300 platform. with "-fsingle" build option, the "ghs" compiler will generate hardware instruction for single-precision floating operation, and generate software instruction for double-precision floating operation. Signed-off-by: guoshichao <guoshichao@xiaomi.com>
Apache NuttX is a real-time operating system (RTOS) with an emphasis on standards compliance and small footprint. Scalable from 8-bit to 64-bit microcontroller environments, the primary governing standards in NuttX are POSIX and ANSI standards. Additional standard APIs from Unix and other common RTOSs (such as VxWorks) are adopted for functionality not available under these standards, or for functionality that is not appropriate for deeply-embedded environments (such as fork()).
For brevity, many parts of the documentation will refer to Apache NuttX as simply NuttX.
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